Presenting a mathematical model for determining oil leakage in hydraulic directional control valves with spool

Author

Assist. Prof., Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran

10.22044/jsfm.2025.15107.3897

Abstract

This article presented a mathematical model for determining oil leakage in directional control valves, based on orifices resulting from spool displacement and clearance. To evaluate the accuracy of the mathematical model presented in different working conditions and to measure the quantities related to oil leakage in the directional control valve including the spool, the design and construction of a hydraulic power transmission system was carried out. An acceptable agreement was obtained between the analytical and experimental results in different conditions. Examining the results showed that the use of HL32 and HL68 oils, compared to HL46 oil, in the power transmission system, respectively, caused a 33.1% increase and a 24.4% decrease in the maximum oil leakage, and a 14.2% decrease and a 19.9% increase in the pressure sensitivity of the proportional control valve. On the other hand, increasing the oil pressure in the pump outlet port, from 50 to 100 bar, and 100 to 200 bar, respectively, leads to an increase of 88.6% and 77.8% of the maximum flow gain in the direction control valve. In the same way, by doubling the oil pressure in the pump port, the pressure sensitivity and the flow gain of the directional control valve increased by 33.3% and 41.3%, respectively.

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References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 6
May and June 2025
Pages 75-90

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